Also, each ruler can move the capital once per lifetime, but gets a free capital move to the de jure capital of your primary title if you own it. If your de jure title is Poland, you can save up tech points, move capital to Kiev, spend them, move capital back to Krakow, until you are ready to move it for good.
Oh, thanks didn't know.
That could cause some capital-dancing in the near future.:happy: